Inspection of ECM (PCM) and Its Circuits
Inspection Of ECM (PCM) And Its CircuitsCAUTION: ECM (PCM) cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to ECM (PCM) with couplers disconnected from it.
ECM (PCM) and its circuits can be checked at ECM (PCM) wiring couplers by measuring voltage.
Voltage Check
1. Remove ECM (PCM) from vehicle.
For H27 engine model, refer to Engine Control Module (ECM) / Powertrain Control Module (PCM) Removal and Installation:H27 Engine.
2. Connect ECM (PCM) couplers to ECM (PCM).
3. Check each terminal voltage with couplers connected.
For H27 engine model, refer to ECM (PCM) Voltage Values Table for Relation of A/C Control for H27 Engine Model.
A/C system wiring circuit diagram
Terminal arrangement of ECM (PCM)
ECM (PCM) Voltage Values Table for Relation of A/C Control